JP2007276779A - Riding type rice transplanter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify a structure of a transmission system to right and left front wheels in a riding type rice transplanter provided with the right and left front wheels and right and left rear wheels. <P>SOLUTION: A differential mechanism is not provided on a front axle case 22 for supporting the right and left front wheels 1. Motive power transmitted to the front axle case 22 is branched to right and left sides through a laterally directed transmission shaft 29 passed through the axle case 22 and is transmitted to the right and left front wheels 1. The right and left front wheels 1 are always driven at a constant speed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  FIG. 1 shows the entire side surface of the riding type rice transplanter according to the present invention, and FIG. 2 shows the entire plane. This riding type rice transplanter includes a link mechanism 5 that is driven to swing up and down by a hydraulic cylinder 4 at the rear of a four-wheel drive type traveling machine body 3 having a front wheel 1 that can be steered and a rear wheel 2 that cannot be steered. The seedling planting device 6 is connected to the rear of the traveling machine body 3 through an engine, and an engine 7 is provided at the rear of the traveling machine body 3, and a step 8 covering the engine 7 and the upper part of the traveling machine body 3 is detachably provided. The driver seat 9 is provided at the left and right central portion of the rear upper surface in Step 8, and the steering handle 11 is provided on the upper portion of the central front cover 10 erected at the front end portion of the traveling machine body 3.

  The seedling planting device 6 is configured to have a three-row planting specification. A seedling bed 12 on which three mat-like seedlings are placed side by side and reciprocated laterally with a constant stroke, and 1 from the lower end of the seedling bed 12. It consists of three sets of crank-type planting mechanisms 13 that cut out seedlings and plant them on the surface, leveling float 14 that leveles the planting location on the surface, and so on. The hydraulic cylinder 4 is controlled based on the vertical displacement of the swinging leveling float 14 that can swing freely, and the seedling planting device 6 is stably maintained at a height set with respect to the rice field regardless of whether the traveling machine body 3 is raised or lowered. Therefore, automatic planting depth control is performed to maintain a stable planting depth.

  In the traveling machine body 3, a transmission case 21 that pivotally supports the rear wheel 2 is connected to a rear end of a main frame 20 made of a pipe material, and a front axle case 22 equipped with a front wheel 1 is attached to the front end of the main frame 20. The main frame 20 has a function as a transmission case through which a front wheel drive shaft 23 that transmits power from the transmission case 21 to the front axle case 22 is inserted.

  As shown in FIG. 4, the engine 7 uses an air-cooled gasoline engine with an output shaft 7 a protruding on the left side surface. The output shaft 7a and the input shaft 21a protruding from the left side surface of the transmission case 21 are interlocked and connected by a belt transmission mechanism 25 having a tension type main clutch 24. The main clutch 24 is mechanically linked to a main clutch / brake pedal 26 provided at the foot on the right front side of step 8.

  As shown in FIG. 3, the engine power input to the mission case 21 is branched into a traveling system and a working system, and the traveling system power is gear-shifted into a plurality of stages and then left and right through the left and right side clutches 27. While being transmitted to the wheel 2, a part of the traveling system shift power is taken forward and transmitted to the front axle case 22 via the front wheel drive shaft 23, and the working system power branched in the transmission case 21. Is taken out from the upper part of the mission case 21 and transmitted to the seedling planting device 6 via the telescopic transmission shaft 15.

  The front axle case 22 is not equipped with a differential mechanism, and the transmitted power is branched to the left and right through a lateral transmission shaft 29 inserted through the front axle case 22 so that the left and right front wheels 1 are always driven at a constant speed. It has come to be. Further, a multi-plate brake 30 that acts on the lateral transmission shaft 29 is provided at the input portion of the front axle case 22. The brake 30 is mechanically linked to the main clutch / brake pedal 26 so that when the main clutch / brake pedal 26 is depressed, the main clutch 24 is disengaged and the brake 30 is braked. It has become. The main clutch / brake pedal 26 is provided with an operation lever 26a, so that even when driving down to the ground, the main clutch / brake pedal 26 can be manually depressed to stop traveling. ing.

  A pair of left and right body frames 33 made of pipe material are installed across the left and right ends of the front stay 31 horizontally connected to the main frame 20 and the left and right ends of the rear stay 32 horizontally connected to the rear portion of the transmission case 21; The rear part of the step 8 formed by sheet metal pressing is placed and connected to the upper part of the body frame 33. In step 8, the rear part is raised to a height exceeding the engine 7, and an opening 34 through which a part of the engine 7 and the fuselage frame 33 is inserted is formed in the left and right central part of the raised part 8a. 34 is closed by a resin bonnet cover 35 that is detachably locked. A pair of left and right connecting fittings 36 extending from the body frame 33 project upward through a slit 37 formed in the bonnet cover 35, and the driver seat 9 can be turned back and forth on the connecting fitting 36. The pins are connected so that the front and rear positions can be changed. The driver's seat 9 turned to the seating posture is elastically received and supported by left and right cushion springs 38 attached to the upper surface of the raised portion 8a.

  On the right side of the raised portion 8a in step 8, there are a planting lever 41 for moving the seedling planting device 6 up and down and powering the seedling planting device 6 and a sensitivity adjusting lever 42 for adjusting the sensitivity of the planting depth automatic control. Each of them protrudes so as to be swingable back and forth, and a rectangular opening 43 is formed at the rear part of the raised portion 8 a, and the upper half of the fuel tank 44 connected to and supported by the body frame 33 extends upward from the opening 43. It is protruding.

  The fuel tank 43 is formed of a translucent resin material through which the liquid level inside can be seen through, and at an appropriate position on the side surface, in addition to the remaining amount indication scale M1, as shown in FIG. A reference information scale M2 such as an area that can be planted or an operation time that can be planted with the remaining fuel is also written.

  In addition, on the left and right ends of the raised portion 8a in step 8, a reserve seedling table 45 for placing and supporting the spare seedling F is provided so as to be able to stand up and retract, and in the rear central portion of the raised portion 8a in step 8, A preliminary seedling storage frame 46 for receiving and supporting F in a horizontally long standing posture is provided. Further, a recoil knob 47 for starting the engine is provided at the right rear portion of the footrest surface in Step 8, and the left side of the raised portion 8a is formed as a flat auxiliary step surface, and a replenishment tank for refueling (Not shown) is used for mounting. In addition, the supply port 44a of the fuel tank 44 is provided to be deviated to the left side so as to approach the supply tank placed on the left side of the raised portion 8a. Further, as shown in FIG. 2, overhanging portions 8b projecting toward the front wheel 1 are formed on the left and right sides of the front portion of the step 8, and mud lifted by the front wheel 1 adheres to the upper surface of the step. Is prevented.

  A left and right central portion at the front end of Step 8 is formed with a recessed portion 50 that is released forward, and the recessed portion 50 is formed by inserting the central front cover 10 erected on the front end portion of the traveling machine body 3 up and down. It is supposed to be blocked.

  The central front cover 10 is configured in a front-and-back split structure including a front cover portion 10F formed of a resin material and a rear cover portion 10R formed of a sheet metal material, and the lower end of the rear cover portion 10R is a front axle case. The front cover portion 10F is detachably locked and connected to the front portion of the rear cover portion 10R. Note that the lower end of the front cover portion 10F extends downward so as to cover the bracket 51 from the front.

  The rear cover portion 10R is formed in a half-cylinder shape opened to the front to give high rigidity, and a steering shaft 52 having the steering handle 11 at the upper end is a bearing provided on the upper portion of the rear cover portion 10R. It is supported through a portion 53 so as to be rotatable. Further, a shift lever 54 for operating a traveling gear transmission mechanism built in the transmission case 21 is provided on the left side of the rear cover portion 10R, and on the right side of the rear cover portion 10R, the engine 7 A hand accelerator lever 55 linked to the accelerator device is provided.

  The lower portion of the steering shaft 52 is vertically supported by the bracket 51 so as to be pivotally supported. As shown in FIG. 3, a pinion gear 56 formed integrally with the lower end of the steering shaft 52 is attached to the bracket 51. The sect gear 57 and the knuckle arm 58 that rotates the left and right front wheels are interlocked and connected to each other by a tie rod 59.

  As shown in FIG. 3, a pair of left and right operation rods 60 extending rearward from the sect gear 57 are linked to left and right side clutches 27 provided in the transmission case 21 so that the sect gear 57 rotates. When the front wheel 1 is steered to the left or right from the straight position beyond the set angle by being operated, the side clutch 27 of the rear wheel 2 on the inside of the turn is automatically turned off in conjunction with this. A small turn is performed in a three-wheel drive state with the left and right front wheels 1 and the one rear wheel 2 on the outside of the turn.

  The riding type rice transplanter according to the present invention is configured as described above, and it is only necessary to remove the bonnet cover 35 at the time of normal maintenance such as plug cleaning of the engine 7, plug replacement, air cleaner element replacement, and the like. When performing a large-scale maintenance of the traveling machine body 3, step 8 is removed. In this case, if the driver's seat 9 is removed from the connecting bracket 36 and the connection between the step 8 and the traveling machine body 3 is released, the step 8 can be removed with the central front cover 10 and the fuel tank 44 left.

  [Another embodiment]

  (1) It is possible to carry out the entire step 8 by resin molding.

  (2) It is possible to configure the entire step 8 in a sheet metal structure and mount and connect the driver seat 9 directly to the upper surface of the step 8.

Overall side view of riding rice transplanter Overall plan view of riding rice transplanter Plan view of traveling system Side view of the rear of the aircraft Front view of fuel tank attachment Longitudinal side view of the front end of the traveling aircraft Exploded perspective view of steps Transverse plan view of the center front cover Front view showing a display example attached to the fuel tank

Explanation of symbols

1 Front wheel 2 Rear wheel 7 Engine 22 Front axle case 29 Lateral transmission shaft

Claims (1)

Right and left front wheels, right and left rear wheels, and a front axle case that supports the right and left front wheels,
Configured to transmit engine power to the right and left rear wheels and the front axle case;
The front axle case is not provided with a differential mechanism, and the power transmitted to the front axle case is branched to the right and left via a lateral transmission shaft inserted into the front axle case and transmitted to the right and left front wheels. A riding type rice transplanter configured such that the right and left front wheels are always driven at a constant speed.

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